Think of the red line as a bicycle chain. The length of the chain is a function of the distance between the centers D, and the radii of each of the circles, R and r. You can change D, R and r by dragging the black dots. How do you expect this length function to behave when r = 0 ?, r = D ?, r = R ? r is much larger than R ? r is much larger than D ? r is much smaller than R? r is much smaller than D? The length of the bicycle chain can be written as a function of the variables r, R and D. Holding R and D constant, sketch the length as a function of r Holding r and D constant, sketch the length as a function of R Holding r and R constant, sketch the length as a function of D